Here are some anaglyph close-ups of the crater. Cyan/blue 3D glasses required. I tried to use the gray-scale images but the depressions kept becoming mounds in my mind. If anyone wants to check the large gray-scale, look here -- WARNING 206 megabyte image:

Does anyone have any info, or links, relating to the measured versus predicted gravity on Mars.Given that gravity in the current model relies on mass, i am wondering if there is a discrepancy between prediction and measurements by the various landers (if they had such a sensor on board). And if so, by what percentage they two were different.

Should be very easy to test gravity on Mars since it's a downward push. Transport a bathroom scale to Mars with a known weight on top and compare the difference. Much more complicated than that but that's the concept.

Despite remote sensing investigation by Mars Express, Mars Reconnaissance Observer and Mars Global Surveyor, the composition of Deimos has not been resolved. The composition is a key indicator in the search for the origins of Deimos and Phobos. Data from the Mars Express OMEGA spectrometer suggest that Deimos has a primitive composition. Like Phobos, Deimos is thought to be quite porous.

Despite remote sensing investigation by Mars Express, Mars Reconnaissance Observer and Mars Global Surveyor, the composition of Deimos has not been resolved. The composition is a key indicator in the search for the origins of Deimos and Phobos. Data from the Mars Express OMEGA spectrometer suggest that Deimos has a primitive composition. Like Phobos, Deimos is thought to be quite porous.

Mass: 1.5 × 1015 kg

Density is 1.7 gm/cm^3 ESA page didn't have the density.

~Paul

I agree the density calculations and mass as the unique driver of gravity is questionable, but the OP query was merely asking if gravity had been measured and it has using its moons. The mass of the moons are irrelevant with respect to measuring Mars gravity.

I hope the links work. If it doesn't then just go to Spaceweather.com and noodle around for it. You'll see it.

+++

The other day "Steve" was sighted again. Same phenomenon complete with the twisted elements, and this time NASA even measured the increase in electrical activity. Do ya suppose it might be a Birkeland current? Of course it is. Maybe it needs to have a poster attached for NASA to get the message.